<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script>
    for (var i = 1; i <= 5; i++) {
      if (i == 3) {
        break;// 只要遇到 break 就退出整个循环不执行
      }
      console.log('我正在吃第' + i + '个包子');
    }
  </script>
</head>

<body>

</body>

</html>